The act of laying your soft penis in front of a person place or thing and immediatly get a sudden physical hardness in your private region were it extends to a length that it slaps the target object straight in the jaw and secretes a sticky white fluid on the target that simulates spidermans webs.
also see spiderman ass and Spidey Senses are Tingling

YO BROSEPHINO last night your grandma took the Websling Dong like a trooper!!